Wedge



N. L. MALMGREN `june .50, 1925.

L fl '5 l atenten at?,

NELs L. Matrassen, orY CHICAGO, ILLINOIS.

WEDGE.

l Application filed May 2,

! 10 all whom it may Concern v Be it known that I, Nuns L. MALMGREN, acitizen of the United States, and a resident of Chicago, in the countyof Cool; and State` of Illinois, have invented an Improved lVedge, ofwhich the following is a specification.

This invention relates to wedges.

The object of the invention is 'to provide wedges which, undercontemplated conditions of use will be practically self-locking whensubjected to usual stresses tending to cause slipping and looseningthereof.

To attain this object, wedges' embodying my invention and improvementscomprise wedges the wedging surfaces of which are inclined bothlengthwise and transversely relative to the plane of the vback of thewedgepreferably at the same' angleswdesigned to be used in pairsdisposed at an angle to each other-preferably at right angles. Thus,when a pair of wedges is utilized in association with a structureaffording rigid abutments at the sides of the transverse wedgingsurfaces thereof adjacent to the thin or smaller ends of said wedgesformed by the longitudinal wedging surfaces, it is obvious that when thewedges are forced endwise, components of force will be produced tendingto impart coincident lateral movement to one or both of said Wedgeswhich, if continued, will bring a side of one or both thereof intostrong frictional engagement with the abutments adjacent to V the thinor smaller ends of the longitudinally inclined wedging surfaces thereof,respectively, which will e'ectually present said wedges from workingloose under usual conditions.

My invention also comprises the various other features and details ofconstruction hereinafter described and claimed.

In the accompanying drawings, in which nly invention is fullyillustrated,

Figure 1 is a perspective view of a wedge embodying my invention andimprovements.

Figures 2 and 3 are views of opposite ends thereof.

Figure 4 is a side view showing a pair of my improved wedges assembledfor use in a supporting base affording suitable lateral abutments; and

Figure 5 is a top plan view thereof.

Describing a wedge embodying my invenr tion and improvements withparticular reference to Figs. 1 to 3 of the drawings, 1 des- 19224,ySerial No. 710,694.

ignates the wedge, the wedging surface of which is inclined Vbothlongitudinally,as shown at 2, and transversely as shown at 3 relative tothe plane of the back of the wedge. My improved wedges are designed tobe used in pairs disposed at an angle to each other-preferably at 'rightangles-in association with a structure which affords lateral abutmentsat the sides thereof adjacent to the thin or entering Vends of thelongitudinal wedging surfaces of said wedges, respectively, whereby whensaid wedges are forced endwise, the transverse wedging surfaces thereofwill produce components of force tending to' impart lateral movement tosaid wedges towards the thin or entering end of the other wedge which,

if continued, will bring a side of said wedge into strong frictionalengagement with the abutment adjacent thereto. j

For purposes of clear and definite illustra' tion, I have, in Figs. 4and 5 of the drawdesignated 1, 12, respectively, in association 80 witha base portion designated as a whole 4, as applied in use for Supportinga Weight, indicated diagrammatically at 5, Fig. 4, j which may typifyany kind of a load to be l raised or supported by said Wedges.

The base portion 4 consists of a lower portion or base proper 6 formedon which are upwardly extending lugs or projections 7, whichV definegrooves or slots 8, 8 which preferably extend at right angles to eachother and in which the wedges 1, 12 are confined, the lower wedge lbeing shown seated on the bottom of the groove 8 and the wedge 12 beingseated upon the wedge 1 with their wedging surfaces in contact.

The slots'or grooves 8, 8', are slightly wider than the wedges l', 12.

The wedges 1, 12 are shown supporting a Weight 9, indicateddiagrammatically, and which may typify any kind of load sustained bysaid wedges.

With wedges constructed and applied as described, it is obvious thatwhen said wedges are forced endwise either to force them in or out, thelaterally inclined surface 3 of each wedge, acting on the longitudinallyinclined surface 2 of the other wedge will produce components of forcetending to impart coincident lateral movement to said wedges towards thethin or entering end of the other wedge which, if continued, will bringthe sides of said ings, shown a pair of my improved wedgesinm. i

wedges respectively ,adjacent to the smell end of the other Wedge, intostrong frictional engagement- With the lugs or projections 7 on the base4Which Will eil'ectively prevent said Wedges fromV becoming loose underany Stresses to which they Will be subjected in ordinary use.V

It Will be understood that the :base 4k merelyrexemplilies any structurewhich 2liords lateralyabutment-s for Wedges applied .in the' mannershown and described, adupted` .to lprevent seid Wedges fromworkingloose.

. I do not, therefore, desire to limit myself Y ,f 1. Wedges, eachcomprising-a'planevveflg-V y to the-particular Vstructure orVVapplication shown, but claim the use of .wedges embodying my inventionand imp-comments in con` neet-ion with `any Structure to `Wl1ichvit maybe applied in manner to produce the results contemplated.

I claim of the back of .the Wedge, designed to be used in pairs disposedat an angle to each Vother with their VWedging surfaces yin con`r tact.l

` 2; Wedges as speciiedin cla-im l, in whichV the corresponding Wedgmgsurfaces of different Wedges are inclined at the Vsame angles. "j

the angles of inclination of the Wedging surfaces are the samebothlongitudinally and trim'sversely.y Y

4. Wedges as specified claim 1, i

' vday of April, A. 1924.

s NELS L. MALMGREN. f

lng surface which isfinclined both lengtlij Wise and transverselyrelative to the plane 3. YVedges as specified in claim 1', in which

